A novel turn off fluorescent sensor for Fe(III) and pH environment based on coumarin derivatives: the fluorescence characteristics and theoretical study

摘要

In this work, a novel coumarin fluorescent sensor for Fe3+ and the pH change in DMSO was successfully prepared, and the spectra properties of the sensor a and especially its activity to metal ions, were also investigated This sensor showed an extreme selectivity and sensitivity to Fe3+ compared with other competing metal ions through fluorescence quenching in DMSO, which formed a 2:1 complex with Fe3+ and displayed fluorescent quenching. Furthermore, the binding mechanism was studied by the binding stoichiometry and DFT calculation, and the quenching mechanism was also confirmed by Mulliken's charge distribution which was calculated by quantum chemistry. (C) 2016 Published by Elsevier Ltd.